2012 Lexus LS 460 AWDFACTORY OEM SERVICE PROCEDURE

Radio Receiver Communication Error: Procedure

  1. IDENTIFY COMPONENT SHOWN BY THE SUB-CODE 
    1. Enter the diagnostic mode.
      Fig 1: Identifying Display Screen - Service Check Mode (Example)
      GTY150536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "2" to change to "Detailed Information Mode".
    3. Identify the component shown by the sub-code.

      HINT: 

      • "190 (radio receiver)" is the component shown by the sub-code in the example shown in the illustration.
      • For details of the DTC display, refer to the "DTC CHECK/CLEAR". Refer to DTC CHECK / CLEAR .

    NEXT: Go to next step 

  2. CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE 
    1. Inspect the power source circuit of the component shown by the sub-code.

      If the power source circuit is operating normally, proceed to the next step.

      COMPONENT TABLE

      Component Proceed to
      Integration control and panel assembly (1C4) Integration control and panel assembly power source circuit
      Stereo component amplifier (440) Stereo component amplifier power source circuit

    NEXT: Go to next step 

  3. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the L51 and L52 receiver connectors.
      Fig 2: L51 and L52 Receiver Connectors
      GTY257703Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      L51-5 (ATX+) - L51-15 (ATX-) Always 60 to 80 Ω
      L52-9 (TX+) - L52-10 (TX-) Always 60 to 80 Ω

    NG → See step   6 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT SHOWN BY SUB-CODE) 

    HINT: 

    • Start the check from the circuit that is near the component shown by the sub-code first.
    • For details of the connectors, refer to the "Terminals of ECU". Refer to TERMINALS OF ECU .
    1. Referring to the AVC-LAN wiring diagram, check the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.
      1. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.

        OK

        There is no open or short circuit.

        Fig 3: Identifying AVC-LAN wiring diagram
        GTY261981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. REPLACE COMPONENT SHOWN BY SUB-CODE 
    1. Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.

      OK

      Same problem does not occur.

    NG → See step   7 

    OK → END 

  6. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
  7. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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